Bolt-anchor.



H. W. PLEISTER; BOLT ANCHOR.

APPLIUATION FILED JULY 18,1911.

{1,05 1,4441. Patented Jan. 28, 1913. I

ATTORNEY UNITED sTATEs- 1ENT OFFICE.

HENRY W. FLEISTER, 0F WESTFIELD, NEW JERSEY, ASSIGNOR TO HENRY BNEWHLALL, OF PLAINFIELD, JERSEY.

BOLT-ANCHOR.

Specification of Letters Patent.

Patented Jan. 28, 1913.

Application filed July 18, 1911. Serial No. 639,120.

To all whom it may concern:

Be itknown that I, HENRY \V. Pnnrsrnn, a citizen of the United States,and a resident of \Vestfield, in the county of Union and State of NewJersey, have invented certain new and 1 useful Improvements in Bolt-Anchors, of which the following is a specification, takenin connectionwith the accompanyingdrawings, which form a part of the same. I

This invention relates to boat anchors and moreparticularly to a onepiece bolt anchor which is preferably, though not necessarily, formed ofsome ductile material.

. IMy invention further relates to certain details of construction whichwill be more fully hereinafter described in the specificati'on' andpointed out in theclaims.

In" the accompanying drawings I have shown an illustrative embodiment ofmy invention in which the same reference numerals refer to similar partsin the several 7 figures.

' anchor, the support and article supported.

I Figure 1,1s a sideelevation of my improved bolt anchor with, itscooperating bolt or screw, thesupport and article supported being shownin sections; Fig.2 is a vertical section through my improved bolt beingshown in section, and the cooperating belt or screw in side elevation;Fig. 3 1s a section substantially on the line 3+3 of. Fig. 2; Fig. 4 isa section substantially on the line, 44 of Fig. 2; Fig. 5 is a sectionsubstantially on the line 5-5 of Fig. 2; Fig. 6 is a. View substantiallyon the line 5--5 of Fig. 2, but showing the position of the parts whenin their expanded position; Fig. 7 is a section substantially on theline ,H of Fig. 2, but showing the bolt anchor expanded and the bolt insection; Fig. 8 is a section sub stantially on the line.3--3 after thebolt anchor has been expanded; and Fig. 9 is a view of the axial bore ofthe bolt anchor.

In. the illustrative embodiment of this invention shown in thedrawing, 1is a onepiece bolt anchor formed of any suitable material but preferablyof some ductile material, as for example, lead or an alloy. The boltanchor consists essentially of a hollow body member Qand one or moretines 3, 3, two being shown in the-drawing, though, of course,- it is tobe understood that a greater number may be used, if desired.

'drical greater extent than I do the transverse pro- .rather thanhorizontally, as shown.

The exterior contour of the bolt anchor,

before it is expanded, is substantially cyline drical having transverseribs 4, l on one portion and longitudinal ribs 5 5 on another portion.These longitudinal and transverse ribs may be arranged at various anglesto each other, but preferably I arrange them substantially at rightangles to each other, as shown. i

The longitudinal and transverse projections 5,

surface 25 oi? the bolt anchor 1 to the same extent or y. be varied withrelation to each other, as may be found convenient or expedient. Ipreferably extend the lpngitudinal projections 5, 5 outfromthecylinsurface 25 of the bolt anchor to a jections 4:, 4. A one piecebolt anchor, therefore, equipped with .my invention can be readilyinserted in an aperture 6 in a support 7 of masonry, brick, plaster,terra cotta, wood,'cement, or anv other suitable support until thelongitudinally extending ribs 5, 5 contact with the interior surface 8'of the aperture 6. By pressure upon the bolt anchor, or by giving it alight blow with a hammer or other similar tool, the longitudinal ribs 5,5 will either cut their way into the wall 8 of the aperture 6, if the'support' 7 is of softer material than the longitudinally extending ribs5: or, if the support Tis of harder material than that of thelongitudinally extending ribs 5 they will be mashed down, but in eithercase thev will firmly engage the interior surface 8 of the aperture 6and prevent the bolt anchor from slipping out of the aperture or beingforced in by the bolt or screw: 9 farther than desired. TlllS'fziS ofmarked advantage in many locations, particularly where the aperture 6 isdriven vertically into a support The longitudinal ribsfi furthermoreserve to hold the bolt anchor and prevent its rotation in the aperturetiwhile the bolt or screw 9 is expanding it. K i

The entire bolt "anchor 1 including the transverse ribs 4. 4 andlongitudinal ribs 5, 5 are preferably all formed out of some ductilematerial such as lead or an alloy. thereby forming a one piece ductilebolt. anchor in which the longitudinally extend- ?i and ,4, 4,respectively, may be formed so to extend above the cylindrical ing ribs5, 5 serve to position and prevent relative rotation of the bolt anchor,while the male threads 10 upon the bolt 9 are cutting their owncooperating female threads on the interior of the bolt anchor.

\Vhen the bolt anchor has been expanded by the bolt or screw 9 tosupport any suitable article 11, it is clear that the transverseprojections l, 4 will bite into the surrounding wall 8 of the aperture 6and will exert the maximum resistance to any strain or pull upon thebolt or screw 9, or the article supported 11, whichwould tend towithdraw t'he one piece bolt anchor l from the support 7. It is equallyclear that the maxi mum expansion of the one piece bolt anchor -will beat or near the ends of the tines 3,3

which will be the farthest removed from the surface 12 of the support 'Iand consequently will prevent any marring or crumbling of the face ofthe support. i

To permit ready expansion of the tines 3,3 I may form the end of theslot. 13 between the tines with an enlarged opening 14 which will permitthem to easily swing or bendupon the body member 2 of the bolt anchor.

The longitudinal ribs 5 may be given various shapes. I preferably formthem as segments of a circle, their highest point being substantially at15 and curved or tapered from that point to the points 16 and 16.Preferably the center'of the circle of which the projections 5'aresegments lies in the axis of the cylindrical bolt anchor. I-alsopreferably provide the axial bore of the bolt anchor with internallongitudinally extending ribs 18, 18 within which the female screwthreads can be more readily cut by the male threads of the bolt or screw9. These internal longitudinal ribs, however, may be omitted withoutdeparting from my invention. 7 Another portion of my inventionconiprises a one piece 'bolt anchor with a peculiar axial bore. Thisaxial bore-is formed tapering and elliptical in cross section, the minoraxes, of the different ellipses decreasing in length as the end 20 ofthe bolt anchor is approached, at which point the smallest ellipse willbe formed.

Preferably the interior bore 21 is formed circular in cross section atone end of the bolt anchor, Figs. 5 and 9 and from sub stantially thatpoint to the end 20,01 the bolt anchor it is formed elliptical in crosssection, the longest axes of the different ellipses coinciding with theslots 13 between the different tines 3, 3 Figs. 3 and 4. A view of theaxial bore is shown in Fig. 9. With the bolt anchor formed with such anaxial bore it is found in-practice that the interior surfaces 522, 22 ofthe tines 3, 3 and which formed originally a portion of the ditl'erentellipses, will form a wedge surface and when expanded by the belt orscrew 9, a maximum bearing or engaging surface to cooperate with thebolt or screw 9 and accurately fit the bolt screw-as stain Y for If theductii example in l boltanchor and prcii male 'tlir 15 t ed r" h sochpses uni term :ly the minor 3 and '1, both the minor iinerent eliip as.

the bolt "Hit ml each antiall mum expanof the lit- 5 a true M the entireantially cylindrigeinent with the threaded screw. -ng thus de cribedthis invention in connection with sev .i iilustrative embodi- I may inmerits thereof toihe detains of which I do not desire to be iim' what isclaimed as new and what it desired to secure by Let-. ters Patent is.set forth in the appended claims.

I claim- 1. A bolt anchor comprising a. hollow ex pansible shieldprovided with an axial taper'ing bore elliptical in cross section, the

ITllnOljlXGS of the ellipses progressively decreasing in length theinner end of the anchor is approached, the nnjoraxes of the dilt'erentellipses remaining substantially constant.

2. A bolt anchor comprising a'holiow ex pansible shield provided with anaxial ta pering l larger I and sub: .ially from that end to the otherend ellipical in cross section, the minor axes ot'tl'ie ellipsesprogressively circular in cross section at its decreasing in. length asthe inner end of the anchor is approached the major axes of thedifferent. ellipses remaining substantiilly constant, l

3. A' one part ductile bolt anchor comprising an expansible memberprovided with an .axial tapering bore elliptical in cross-sec- 5 5. Aone part bolt anchor com rising a' body member and a plurality of tines,and provided with an axial tapering bore elliptical in cross-section,the major axes substantially coinciding with a line drawn through theopenings between the tines and remaining substantially constant, theminor axes of the ellipses progressively, decreasing in length as theinner end of the anchor is approached.

6. A one part ductile bolt anchor comprisin a body member and aplurality of tines, an provided with an axial tapering bore ellipticalin cross-section, the major axes substantially coinciding with a linedrawn $420 through the openin between the tines and remainingsubstantially constant, the minor axes of t e ellipses progressiveldecreasing in length as the inner end of t e anchor is approached. V

' 7. A one part bolt anchor comprisin a body member and two tines, andprovit led with an axial tapering bore elliptical in cross section, themajor axes substantially coinciding with a line drawn through theopenings between the tines and remaining substantially constant, theminor axes of the the one elli ses progressively decreasing in length ast 1e inner end of the anchor is approached.

8. A one part ductile bolt anchor comprisin a body-member, and twotines, and provi ed with an axial ta ering bore elliptical in crosssection, the ma or axes substantially coinciding with a line drawnthrough the openings between the tines and remaining substantiallyconstant, the minor axes of the ellipses progressively decreasing inlength as the inner end of the anchor is approached.

9. A one part bolt anchor havin its exterior surface of substantially auni orm diameter throughout and provided with a tapered ellipticalinterior bore, transverse projections 0n the forward exterior surface ofthe one piece bolt anchor and longitudinal projections of slightlygreater height upon the rear exterior surface of the one part boltanchor making that end of a diameter slightly greater than the forwardend of part bolt anchor, the minor axes of the interlor ellipsesprogressively decreasing in length as the inner end of the anchor isapproached, the major axes of the diflerent ellipses remaining constant.

HENRY \V. PLEISTER.

Witnesses:

C. M. LYoNs, A. M. WILLIAMS.

